ALEXANDRIA, Va., Jan. 20 -- United States Patent no. 12,528,149, issued on Jan. 20.
"Angle grinder" was invented by Wei Jin (Jinhua, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is an angle grinder. An operation body is configured to control the polishing of an action head end, one end of a head housing is detachably connected to the operation body, the other end of the head housing is detachably connected to a front cover. One end of a rotor shaft extends out of the head housing and the front cover; a bearing is sleeved on the periphery of the rotor shaft; the front cover is located on the periphery of the bearing; and an installation stopper can be detachably installed on the rotor shaft ...